@mrbombastic;
To backup of the CAFD files from your car, as soon as you start reading the CAFD files from your car, E-Sys automatically stores the files into "C:\ESysData\CAF". All you need to do is to copy these files and store them somewhere safe. It's best is to make a new copy, and keep all previous ones, every time you want to code, this way you always have a copy of the last working version.